1
2
3
4
5
6
7
8
9
10
11
12
13
14#define KMSG_COMPONENT "tape"
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/kmod.h>
18#include <linux/spinlock.h>
19#include <linux/vmalloc.h>
20#include <linux/list.h>
21
22#include <asm/types.h>
23
24#define TAPE_DBF_AREA tape_core_dbf
25
26#include "tape.h"
27#include "tape_std.h"
28
29#define LONG_BUSY_TIMEOUT 180
30
31static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
32static void tape_delayed_next_request(struct work_struct *);
33static void tape_long_busy_timeout(unsigned long data);
34
35
36
37
38
39
40static LIST_HEAD(tape_device_list);
41static DEFINE_RWLOCK(tape_device_lock);
42
43
44
45
46debug_info_t *TAPE_DBF_AREA = NULL;
47EXPORT_SYMBOL(TAPE_DBF_AREA);
48
49
50
51
52const char *tape_state_verbose[TS_SIZE] =
53{
54 [TS_UNUSED] = "UNUSED",
55 [TS_IN_USE] = "IN_USE",
56 [TS_BLKUSE] = "BLKUSE",
57 [TS_INIT] = "INIT ",
58 [TS_NOT_OPER] = "NOT_OP"
59};
60
61const char *tape_op_verbose[TO_SIZE] =
62{
63 [TO_BLOCK] = "BLK", [TO_BSB] = "BSB",
64 [TO_BSF] = "BSF", [TO_DSE] = "DSE",
65 [TO_FSB] = "FSB", [TO_FSF] = "FSF",
66 [TO_LBL] = "LBL", [TO_NOP] = "NOP",
67 [TO_RBA] = "RBA", [TO_RBI] = "RBI",
68 [TO_RFO] = "RFO", [TO_REW] = "REW",
69 [TO_RUN] = "RUN", [TO_WRI] = "WRI",
70 [TO_WTM] = "WTM", [TO_MSEN] = "MSN",
71 [TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF",
72 [TO_READ_ATTMSG] = "RAT",
73 [TO_DIS] = "DIS", [TO_ASSIGN] = "ASS",
74 [TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON",
75 [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS",
76 [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC",
77};
78
79static int devid_to_int(struct ccw_dev_id *dev_id)
80{
81 return dev_id->devno + (dev_id->ssid << 16);
82}
83
84
85
86
87
88
89
90static ssize_t
91tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf)
92{
93 struct tape_device *tdev;
94
95 tdev = dev_get_drvdata(dev);
96 return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state);
97}
98
99static
100DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL);
101
102static ssize_t
103tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf)
104{
105 struct tape_device *tdev;
106
107 tdev = dev_get_drvdata(dev);
108 return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor);
109}
110
111static
112DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL);
113
114static ssize_t
115tape_state_show(struct device *dev, struct device_attribute *attr, char *buf)
116{
117 struct tape_device *tdev;
118
119 tdev = dev_get_drvdata(dev);
120 return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ?
121 "OFFLINE" : tape_state_verbose[tdev->tape_state]);
122}
123
124static
125DEVICE_ATTR(state, 0444, tape_state_show, NULL);
126
127static ssize_t
128tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf)
129{
130 struct tape_device *tdev;
131 ssize_t rc;
132
133 tdev = dev_get_drvdata(dev);
134 if (tdev->first_minor < 0)
135 return scnprintf(buf, PAGE_SIZE, "N/A\n");
136
137 spin_lock_irq(get_ccwdev_lock(tdev->cdev));
138 if (list_empty(&tdev->req_queue))
139 rc = scnprintf(buf, PAGE_SIZE, "---\n");
140 else {
141 struct tape_request *req;
142
143 req = list_entry(tdev->req_queue.next, struct tape_request,
144 list);
145 rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]);
146 }
147 spin_unlock_irq(get_ccwdev_lock(tdev->cdev));
148 return rc;
149}
150
151static
152DEVICE_ATTR(operation, 0444, tape_operation_show, NULL);
153
154static ssize_t
155tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf)
156{
157 struct tape_device *tdev;
158
159 tdev = dev_get_drvdata(dev);
160
161 return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size);
162}
163
164static
165DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL);
166
167static struct attribute *tape_attrs[] = {
168 &dev_attr_medium_state.attr,
169 &dev_attr_first_minor.attr,
170 &dev_attr_state.attr,
171 &dev_attr_operation.attr,
172 &dev_attr_blocksize.attr,
173 NULL
174};
175
176static struct attribute_group tape_attr_group = {
177 .attrs = tape_attrs,
178};
179
180
181
182
183void
184tape_state_set(struct tape_device *device, enum tape_state newstate)
185{
186 const char *str;
187
188 if (device->tape_state == TS_NOT_OPER) {
189 DBF_EVENT(3, "ts_set err: not oper\n");
190 return;
191 }
192 DBF_EVENT(4, "ts. dev: %x\n", device->first_minor);
193 DBF_EVENT(4, "old ts:\t\n");
194 if (device->tape_state < TS_SIZE && device->tape_state >=0 )
195 str = tape_state_verbose[device->tape_state];
196 else
197 str = "UNKNOWN TS";
198 DBF_EVENT(4, "%s\n", str);
199 DBF_EVENT(4, "new ts:\t\n");
200 if (newstate < TS_SIZE && newstate >= 0)
201 str = tape_state_verbose[newstate];
202 else
203 str = "UNKNOWN TS";
204 DBF_EVENT(4, "%s\n", str);
205 device->tape_state = newstate;
206 wake_up(&device->state_change_wq);
207}
208
209void
210tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)
211{
212 if (device->medium_state == newstate)
213 return;
214 switch(newstate){
215 case MS_UNLOADED:
216 device->tape_generic_status |= GMT_DR_OPEN(~0);
217 if (device->medium_state == MS_LOADED)
218 pr_info("%s: The tape cartridge has been successfully "
219 "unloaded\n", dev_name(&device->cdev->dev));
220 break;
221 case MS_LOADED:
222 device->tape_generic_status &= ~GMT_DR_OPEN(~0);
223 if (device->medium_state == MS_UNLOADED)
224 pr_info("%s: A tape cartridge has been mounted\n",
225 dev_name(&device->cdev->dev));
226 break;
227 default:
228
229 break;
230 }
231 device->medium_state = newstate;
232 wake_up(&device->state_change_wq);
233}
234
235
236
237
238static int
239__tape_cancel_io(struct tape_device *device, struct tape_request *request)
240{
241 int retries;
242 int rc;
243
244
245 if (request->callback == NULL)
246 return 0;
247
248 rc = 0;
249 for (retries = 0; retries < 5; retries++) {
250 rc = ccw_device_clear(device->cdev, (long) request);
251
252 switch (rc) {
253 case 0:
254 request->status = TAPE_REQUEST_DONE;
255 return 0;
256 case -EBUSY:
257 request->status = TAPE_REQUEST_CANCEL;
258 schedule_delayed_work(&device->tape_dnr, 0);
259 return 0;
260 case -ENODEV:
261 DBF_EXCEPTION(2, "device gone, retry\n");
262 break;
263 case -EIO:
264 DBF_EXCEPTION(2, "I/O error, retry\n");
265 break;
266 default:
267 BUG();
268 }
269 }
270
271 return rc;
272}
273
274
275
276
277
278static int
279tape_assign_minor(struct tape_device *device)
280{
281 struct tape_device *tmp;
282 int minor;
283
284 minor = 0;
285 write_lock(&tape_device_lock);
286 list_for_each_entry(tmp, &tape_device_list, node) {
287 if (minor < tmp->first_minor)
288 break;
289 minor += TAPE_MINORS_PER_DEV;
290 }
291 if (minor >= 256) {
292 write_unlock(&tape_device_lock);
293 return -ENODEV;
294 }
295 device->first_minor = minor;
296 list_add_tail(&device->node, &tmp->node);
297 write_unlock(&tape_device_lock);
298 return 0;
299}
300
301
302static void
303tape_remove_minor(struct tape_device *device)
304{
305 write_lock(&tape_device_lock);
306 list_del_init(&device->node);
307 device->first_minor = -1;
308 write_unlock(&tape_device_lock);
309}
310
311
312
313
314
315
316
317
318
319int
320tape_generic_online(struct tape_device *device,
321 struct tape_discipline *discipline)
322{
323 int rc;
324
325 DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline);
326
327 if (device->tape_state != TS_INIT) {
328 DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state);
329 return -EINVAL;
330 }
331
332 init_timer(&device->lb_timeout);
333 device->lb_timeout.function = tape_long_busy_timeout;
334
335
336 device->discipline = discipline;
337 if (!try_module_get(discipline->owner)) {
338 return -EINVAL;
339 }
340
341 rc = discipline->setup_device(device);
342 if (rc)
343 goto out;
344 rc = tape_assign_minor(device);
345 if (rc)
346 goto out_discipline;
347
348 rc = tapechar_setup_device(device);
349 if (rc)
350 goto out_minor;
351 rc = tapeblock_setup_device(device);
352 if (rc)
353 goto out_char;
354
355 tape_state_set(device, TS_UNUSED);
356
357 DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id);
358
359 return 0;
360
361out_char:
362 tapechar_cleanup_device(device);
363out_minor:
364 tape_remove_minor(device);
365out_discipline:
366 device->discipline->cleanup_device(device);
367 device->discipline = NULL;
368out:
369 module_put(discipline->owner);
370 return rc;
371}
372
373static void
374tape_cleanup_device(struct tape_device *device)
375{
376 tapeblock_cleanup_device(device);
377 tapechar_cleanup_device(device);
378 device->discipline->cleanup_device(device);
379 module_put(device->discipline->owner);
380 tape_remove_minor(device);
381 tape_med_state_set(device, MS_UNKNOWN);
382}
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397int tape_generic_pm_suspend(struct ccw_device *cdev)
398{
399 struct tape_device *device;
400
401 device = dev_get_drvdata(&cdev->dev);
402 if (!device) {
403 return -ENODEV;
404 }
405
406 DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n",
407 device->cdev_id, device);
408
409 if (device->medium_state != MS_UNLOADED) {
410 pr_err("A cartridge is loaded in tape device %s, "
411 "refusing to suspend\n", dev_name(&cdev->dev));
412 return -EBUSY;
413 }
414
415 spin_lock_irq(get_ccwdev_lock(device->cdev));
416 switch (device->tape_state) {
417 case TS_INIT:
418 case TS_NOT_OPER:
419 case TS_UNUSED:
420 spin_unlock_irq(get_ccwdev_lock(device->cdev));
421 break;
422 default:
423 pr_err("Tape device %s is busy, refusing to "
424 "suspend\n", dev_name(&cdev->dev));
425 spin_unlock_irq(get_ccwdev_lock(device->cdev));
426 return -EBUSY;
427 }
428
429 DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id);
430 return 0;
431}
432
433
434
435
436
437
438
439
440int
441tape_generic_offline(struct ccw_device *cdev)
442{
443 struct tape_device *device;
444
445 device = dev_get_drvdata(&cdev->dev);
446 if (!device) {
447 return -ENODEV;
448 }
449
450 DBF_LH(3, "(%08x): tape_generic_offline(%p)\n",
451 device->cdev_id, device);
452
453 spin_lock_irq(get_ccwdev_lock(device->cdev));
454 switch (device->tape_state) {
455 case TS_INIT:
456 case TS_NOT_OPER:
457 spin_unlock_irq(get_ccwdev_lock(device->cdev));
458 break;
459 case TS_UNUSED:
460 tape_state_set(device, TS_INIT);
461 spin_unlock_irq(get_ccwdev_lock(device->cdev));
462 tape_cleanup_device(device);
463 break;
464 default:
465 DBF_EVENT(3, "(%08x): Set offline failed "
466 "- drive in use.\n",
467 device->cdev_id);
468 spin_unlock_irq(get_ccwdev_lock(device->cdev));
469 return -EBUSY;
470 }
471
472 DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id);
473 return 0;
474}
475
476
477
478
479static struct tape_device *
480tape_alloc_device(void)
481{
482 struct tape_device *device;
483
484 device = kzalloc(sizeof(struct tape_device), GFP_KERNEL);
485 if (device == NULL) {
486 DBF_EXCEPTION(2, "ti:no mem\n");
487 return ERR_PTR(-ENOMEM);
488 }
489 device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA);
490 if (device->modeset_byte == NULL) {
491 DBF_EXCEPTION(2, "ti:no mem\n");
492 kfree(device);
493 return ERR_PTR(-ENOMEM);
494 }
495 INIT_LIST_HEAD(&device->req_queue);
496 INIT_LIST_HEAD(&device->node);
497 init_waitqueue_head(&device->state_change_wq);
498 init_waitqueue_head(&device->wait_queue);
499 device->tape_state = TS_INIT;
500 device->medium_state = MS_UNKNOWN;
501 *device->modeset_byte = 0;
502 device->first_minor = -1;
503 atomic_set(&device->ref_count, 1);
504 INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request);
505
506 return device;
507}
508
509
510
511
512
513struct tape_device *
514tape_get_device_reference(struct tape_device *device)
515{
516 DBF_EVENT(4, "tape_get_device_reference(%p) = %i\n", device,
517 atomic_inc_return(&device->ref_count));
518
519 return device;
520}
521
522
523
524
525
526
527
528struct tape_device *
529tape_put_device(struct tape_device *device)
530{
531 int remain;
532
533 remain = atomic_dec_return(&device->ref_count);
534 if (remain > 0) {
535 DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, remain);
536 } else {
537 if (remain < 0) {
538 DBF_EVENT(4, "put device without reference\n");
539 } else {
540 DBF_EVENT(4, "tape_free_device(%p)\n", device);
541 kfree(device->modeset_byte);
542 kfree(device);
543 }
544 }
545
546 return NULL;
547}
548
549
550
551
552struct tape_device *
553tape_get_device(int devindex)
554{
555 struct tape_device *device, *tmp;
556
557 device = ERR_PTR(-ENODEV);
558 read_lock(&tape_device_lock);
559 list_for_each_entry(tmp, &tape_device_list, node) {
560 if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) {
561 device = tape_get_device_reference(tmp);
562 break;
563 }
564 }
565 read_unlock(&tape_device_lock);
566 return device;
567}
568
569
570
571
572int
573tape_generic_probe(struct ccw_device *cdev)
574{
575 struct tape_device *device;
576 int ret;
577 struct ccw_dev_id dev_id;
578
579 device = tape_alloc_device();
580 if (IS_ERR(device))
581 return -ENODEV;
582 ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
583 ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group);
584 if (ret) {
585 tape_put_device(device);
586 return ret;
587 }
588 dev_set_drvdata(&cdev->dev, device);
589 cdev->handler = __tape_do_irq;
590 device->cdev = cdev;
591 ccw_device_get_id(cdev, &dev_id);
592 device->cdev_id = devid_to_int(&dev_id);
593 return ret;
594}
595
596static void
597__tape_discard_requests(struct tape_device *device)
598{
599 struct tape_request * request;
600 struct list_head * l, *n;
601
602 list_for_each_safe(l, n, &device->req_queue) {
603 request = list_entry(l, struct tape_request, list);
604 if (request->status == TAPE_REQUEST_IN_IO)
605 request->status = TAPE_REQUEST_DONE;
606 list_del(&request->list);
607
608
609 request->device = tape_put_device(device);
610 request->rc = -EIO;
611 if (request->callback != NULL)
612 request->callback(request, request->callback_data);
613 }
614}
615
616
617
618
619
620
621
622void
623tape_generic_remove(struct ccw_device *cdev)
624{
625 struct tape_device * device;
626
627 device = dev_get_drvdata(&cdev->dev);
628 if (!device) {
629 return;
630 }
631 DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev);
632
633 spin_lock_irq(get_ccwdev_lock(device->cdev));
634 switch (device->tape_state) {
635 case TS_INIT:
636 tape_state_set(device, TS_NOT_OPER);
637 case TS_NOT_OPER:
638
639
640
641 spin_unlock_irq(get_ccwdev_lock(device->cdev));
642 break;
643 case TS_UNUSED:
644
645
646
647 tape_state_set(device, TS_NOT_OPER);
648 spin_unlock_irq(get_ccwdev_lock(device->cdev));
649 tape_cleanup_device(device);
650 break;
651 default:
652
653
654
655
656
657 DBF_EVENT(3, "(%08x): Drive in use vanished!\n",
658 device->cdev_id);
659 pr_warning("%s: A tape unit was detached while in "
660 "use\n", dev_name(&device->cdev->dev));
661 tape_state_set(device, TS_NOT_OPER);
662 __tape_discard_requests(device);
663 spin_unlock_irq(get_ccwdev_lock(device->cdev));
664 tape_cleanup_device(device);
665 }
666
667 if (!dev_get_drvdata(&cdev->dev)) {
668 sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group);
669 dev_set_drvdata(&cdev->dev, tape_put_device(dev_get_drvdata(&cdev->dev)));
670 }
671}
672
673
674
675
676struct tape_request *
677tape_alloc_request(int cplength, int datasize)
678{
679 struct tape_request *request;
680
681 BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
682
683 DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize);
684
685 request = kzalloc(sizeof(struct tape_request), GFP_KERNEL);
686 if (request == NULL) {
687 DBF_EXCEPTION(1, "cqra nomem\n");
688 return ERR_PTR(-ENOMEM);
689 }
690
691 if (cplength > 0) {
692 request->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
693 GFP_ATOMIC | GFP_DMA);
694 if (request->cpaddr == NULL) {
695 DBF_EXCEPTION(1, "cqra nomem\n");
696 kfree(request);
697 return ERR_PTR(-ENOMEM);
698 }
699 }
700
701 if (datasize > 0) {
702 request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA);
703 if (request->cpdata == NULL) {
704 DBF_EXCEPTION(1, "cqra nomem\n");
705 kfree(request->cpaddr);
706 kfree(request);
707 return ERR_PTR(-ENOMEM);
708 }
709 }
710 DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr,
711 request->cpdata);
712
713 return request;
714}
715
716
717
718
719void
720tape_free_request (struct tape_request * request)
721{
722 DBF_LH(6, "Free request %p\n", request);
723
724 if (request->device != NULL) {
725 request->device = tape_put_device(request->device);
726 }
727 kfree(request->cpdata);
728 kfree(request->cpaddr);
729 kfree(request);
730}
731
732static int
733__tape_start_io(struct tape_device *device, struct tape_request *request)
734{
735 int rc;
736
737#ifdef CONFIG_S390_TAPE_BLOCK
738 if (request->op == TO_BLOCK)
739 device->discipline->check_locate(device, request);
740#endif
741 rc = ccw_device_start(
742 device->cdev,
743 request->cpaddr,
744 (unsigned long) request,
745 0x00,
746 request->options
747 );
748 if (rc == 0) {
749 request->status = TAPE_REQUEST_IN_IO;
750 } else if (rc == -EBUSY) {
751
752 request->status = TAPE_REQUEST_QUEUED;
753 schedule_delayed_work(&device->tape_dnr, 0);
754 rc = 0;
755 } else {
756
757 DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc);
758 }
759 return rc;
760}
761
762static void
763__tape_start_next_request(struct tape_device *device)
764{
765 struct list_head *l, *n;
766 struct tape_request *request;
767 int rc;
768
769 DBF_LH(6, "__tape_start_next_request(%p)\n", device);
770
771
772
773
774 list_for_each_safe(l, n, &device->req_queue) {
775 request = list_entry(l, struct tape_request, list);
776
777
778
779
780
781 if (request->status == TAPE_REQUEST_IN_IO)
782 return;
783
784
785
786
787
788 if (request->status == TAPE_REQUEST_DONE)
789 return;
790
791
792
793
794
795
796
797 if (request->status == TAPE_REQUEST_CANCEL) {
798 rc = __tape_cancel_io(device, request);
799 } else {
800 rc = __tape_start_io(device, request);
801 }
802 if (rc == 0)
803 return;
804
805
806 request->rc = rc;
807 request->status = TAPE_REQUEST_DONE;
808
809
810 list_del(&request->list);
811
812
813 if (request->callback != NULL)
814 request->callback(request, request->callback_data);
815 }
816}
817
818static void
819tape_delayed_next_request(struct work_struct *work)
820{
821 struct tape_device *device =
822 container_of(work, struct tape_device, tape_dnr.work);
823
824 DBF_LH(6, "tape_delayed_next_request(%p)\n", device);
825 spin_lock_irq(get_ccwdev_lock(device->cdev));
826 __tape_start_next_request(device);
827 spin_unlock_irq(get_ccwdev_lock(device->cdev));
828}
829
830static void tape_long_busy_timeout(unsigned long data)
831{
832 struct tape_request *request;
833 struct tape_device *device;
834
835 device = (struct tape_device *) data;
836 spin_lock_irq(get_ccwdev_lock(device->cdev));
837 request = list_entry(device->req_queue.next, struct tape_request, list);
838 BUG_ON(request->status != TAPE_REQUEST_LONG_BUSY);
839 DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id);
840 __tape_start_next_request(device);
841 device->lb_timeout.data = (unsigned long) tape_put_device(device);
842 spin_unlock_irq(get_ccwdev_lock(device->cdev));
843}
844
845static void
846__tape_end_request(
847 struct tape_device * device,
848 struct tape_request * request,
849 int rc)
850{
851 DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc);
852 if (request) {
853 request->rc = rc;
854 request->status = TAPE_REQUEST_DONE;
855
856
857 list_del(&request->list);
858
859
860 if (request->callback != NULL)
861 request->callback(request, request->callback_data);
862 }
863
864
865 if (!list_empty(&device->req_queue))
866 __tape_start_next_request(device);
867}
868
869
870
871
872void
873tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request,
874 struct irb *irb)
875{
876 unsigned int *sptr;
877 const char* op;
878
879 if (request != NULL)
880 op = tape_op_verbose[request->op];
881 else
882 op = "---";
883 DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n",
884 irb->scsw.cmd.dstat, irb->scsw.cmd.cstat);
885 DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op);
886 sptr = (unsigned int *) irb->ecw;
887 DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]);
888 DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]);
889 DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]);
890 DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]);
891}
892
893
894
895
896
897
898static int
899__tape_start_request(struct tape_device *device, struct tape_request *request)
900{
901 int rc;
902
903 switch (request->op) {
904 case TO_MSEN:
905 case TO_ASSIGN:
906 case TO_UNASSIGN:
907 case TO_READ_ATTMSG:
908 case TO_RDC:
909 if (device->tape_state == TS_INIT)
910 break;
911 if (device->tape_state == TS_UNUSED)
912 break;
913 default:
914 if (device->tape_state == TS_BLKUSE)
915 break;
916 if (device->tape_state != TS_IN_USE)
917 return -ENODEV;
918 }
919
920
921 request->device = tape_get_device_reference(device);
922
923 if (list_empty(&device->req_queue)) {
924
925 rc = __tape_start_io(device, request);
926 if (rc)
927 return rc;
928
929 DBF_LH(5, "Request %p added for execution.\n", request);
930 list_add(&request->list, &device->req_queue);
931 } else {
932 DBF_LH(5, "Request %p add to queue.\n", request);
933 request->status = TAPE_REQUEST_QUEUED;
934 list_add_tail(&request->list, &device->req_queue);
935 }
936 return 0;
937}
938
939
940
941
942
943int
944tape_do_io_async(struct tape_device *device, struct tape_request *request)
945{
946 int rc;
947
948 DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request);
949
950 spin_lock_irq(get_ccwdev_lock(device->cdev));
951
952 rc = __tape_start_request(device, request);
953 spin_unlock_irq(get_ccwdev_lock(device->cdev));
954 return rc;
955}
956
957
958
959
960
961
962static void
963__tape_wake_up(struct tape_request *request, void *data)
964{
965 request->callback = NULL;
966 wake_up((wait_queue_head_t *) data);
967}
968
969int
970tape_do_io(struct tape_device *device, struct tape_request *request)
971{
972 int rc;
973
974 spin_lock_irq(get_ccwdev_lock(device->cdev));
975
976 request->callback = __tape_wake_up;
977 request->callback_data = &device->wait_queue;
978
979 rc = __tape_start_request(device, request);
980 spin_unlock_irq(get_ccwdev_lock(device->cdev));
981 if (rc)
982 return rc;
983
984 wait_event(device->wait_queue, (request->callback == NULL));
985
986 return request->rc;
987}
988
989
990
991
992
993
994static void
995__tape_wake_up_interruptible(struct tape_request *request, void *data)
996{
997 request->callback = NULL;
998 wake_up_interruptible((wait_queue_head_t *) data);
999}
1000
1001int
1002tape_do_io_interruptible(struct tape_device *device,
1003 struct tape_request *request)
1004{
1005 int rc;
1006
1007 spin_lock_irq(get_ccwdev_lock(device->cdev));
1008
1009 request->callback = __tape_wake_up_interruptible;
1010 request->callback_data = &device->wait_queue;
1011 rc = __tape_start_request(device, request);
1012 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1013 if (rc)
1014 return rc;
1015
1016 rc = wait_event_interruptible(device->wait_queue,
1017 (request->callback == NULL));
1018 if (rc != -ERESTARTSYS)
1019
1020 return request->rc;
1021
1022
1023 spin_lock_irq(get_ccwdev_lock(device->cdev));
1024 rc = __tape_cancel_io(device, request);
1025 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1026 if (rc == 0) {
1027
1028 do {
1029 rc = wait_event_interruptible(
1030 device->wait_queue,
1031 (request->callback == NULL)
1032 );
1033 } while (rc == -ERESTARTSYS);
1034
1035 DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id);
1036 rc = -ERESTARTSYS;
1037 }
1038 return rc;
1039}
1040
1041
1042
1043
1044int
1045tape_cancel_io(struct tape_device *device, struct tape_request *request)
1046{
1047 int rc;
1048
1049 spin_lock_irq(get_ccwdev_lock(device->cdev));
1050 rc = __tape_cancel_io(device, request);
1051 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1052 return rc;
1053}
1054
1055
1056
1057
1058static void
1059__tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1060{
1061 struct tape_device *device;
1062 struct tape_request *request;
1063 int rc;
1064
1065 device = dev_get_drvdata(&cdev->dev);
1066 if (device == NULL) {
1067 return;
1068 }
1069 request = (struct tape_request *) intparm;
1070
1071 DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request);
1072
1073
1074 if (IS_ERR(irb)) {
1075
1076 switch (PTR_ERR(irb)) {
1077 case -ETIMEDOUT:
1078 DBF_LH(1, "(%s): Request timed out\n",
1079 dev_name(&cdev->dev));
1080 case -EIO:
1081 __tape_end_request(device, request, -EIO);
1082 break;
1083 default:
1084 DBF_LH(1, "(%s): Unexpected i/o error %li\n",
1085 dev_name(&cdev->dev),
1086 PTR_ERR(irb));
1087 }
1088 return;
1089 }
1090
1091
1092
1093
1094
1095
1096
1097
1098 if (irb->scsw.cmd.cc != 0 &&
1099 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1100 (request->status == TAPE_REQUEST_IN_IO)) {
1101 DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n",
1102 device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl);
1103 request->status = TAPE_REQUEST_QUEUED;
1104 schedule_delayed_work(&device->tape_dnr, HZ);
1105 return;
1106 }
1107
1108
1109 if(request != NULL)
1110 request->rescnt = irb->scsw.cmd.count;
1111 else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) &&
1112 !list_empty(&device->req_queue)) {
1113
1114 struct tape_request *req;
1115 req = list_entry(device->req_queue.next,
1116 struct tape_request, list);
1117 if (req->status == TAPE_REQUEST_LONG_BUSY) {
1118 DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id);
1119 if (del_timer(&device->lb_timeout)) {
1120 device->lb_timeout.data = (unsigned long)
1121 tape_put_device(device);
1122 __tape_start_next_request(device);
1123 }
1124 return;
1125 }
1126 }
1127 if (irb->scsw.cmd.dstat != 0x0c) {
1128
1129 if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE)
1130 device->tape_generic_status |= GMT_ONLINE(~0);
1131 else
1132 device->tape_generic_status &= ~GMT_ONLINE(~0);
1133
1134
1135
1136
1137
1138 DBF_EVENT(3,"-- Tape Interrupthandler --\n");
1139 tape_dump_sense_dbf(device, request, irb);
1140 } else {
1141
1142 device->tape_generic_status |= GMT_ONLINE(~0);
1143 }
1144 if (device->tape_state == TS_NOT_OPER) {
1145 DBF_EVENT(6, "tape:device is not operational\n");
1146 return;
1147 }
1148
1149
1150
1151
1152
1153 if(request != NULL && request->status == TAPE_REQUEST_DONE) {
1154 __tape_end_request(device, request, -EIO);
1155 return;
1156 }
1157
1158 rc = device->discipline->irq(device, request, irb);
1159
1160
1161
1162
1163
1164
1165
1166 switch (rc) {
1167 case TAPE_IO_SUCCESS:
1168
1169 device->tape_generic_status |= GMT_ONLINE(~0);
1170 __tape_end_request(device, request, rc);
1171 break;
1172 case TAPE_IO_PENDING:
1173 break;
1174 case TAPE_IO_LONG_BUSY:
1175 device->lb_timeout.data =
1176 (unsigned long)tape_get_device_reference(device);
1177 device->lb_timeout.expires = jiffies +
1178 LONG_BUSY_TIMEOUT * HZ;
1179 DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id);
1180 add_timer(&device->lb_timeout);
1181 request->status = TAPE_REQUEST_LONG_BUSY;
1182 break;
1183 case TAPE_IO_RETRY:
1184 rc = __tape_start_io(device, request);
1185 if (rc)
1186 __tape_end_request(device, request, rc);
1187 break;
1188 case TAPE_IO_STOP:
1189 rc = __tape_cancel_io(device, request);
1190 if (rc)
1191 __tape_end_request(device, request, rc);
1192 break;
1193 default:
1194 if (rc > 0) {
1195 DBF_EVENT(6, "xunknownrc\n");
1196 __tape_end_request(device, request, -EIO);
1197 } else {
1198 __tape_end_request(device, request, rc);
1199 }
1200 break;
1201 }
1202}
1203
1204
1205
1206
1207int
1208tape_open(struct tape_device *device)
1209{
1210 int rc;
1211
1212 spin_lock_irq(get_ccwdev_lock(device->cdev));
1213 if (device->tape_state == TS_NOT_OPER) {
1214 DBF_EVENT(6, "TAPE:nodev\n");
1215 rc = -ENODEV;
1216 } else if (device->tape_state == TS_IN_USE) {
1217 DBF_EVENT(6, "TAPE:dbusy\n");
1218 rc = -EBUSY;
1219 } else if (device->tape_state == TS_BLKUSE) {
1220 DBF_EVENT(6, "TAPE:dbusy\n");
1221 rc = -EBUSY;
1222 } else if (device->discipline != NULL &&
1223 !try_module_get(device->discipline->owner)) {
1224 DBF_EVENT(6, "TAPE:nodisc\n");
1225 rc = -ENODEV;
1226 } else {
1227 tape_state_set(device, TS_IN_USE);
1228 rc = 0;
1229 }
1230 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1231 return rc;
1232}
1233
1234
1235
1236
1237int
1238tape_release(struct tape_device *device)
1239{
1240 spin_lock_irq(get_ccwdev_lock(device->cdev));
1241 if (device->tape_state == TS_IN_USE)
1242 tape_state_set(device, TS_UNUSED);
1243 module_put(device->discipline->owner);
1244 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1245 return 0;
1246}
1247
1248
1249
1250
1251int
1252tape_mtop(struct tape_device *device, int mt_op, int mt_count)
1253{
1254 tape_mtop_fn fn;
1255 int rc;
1256
1257 DBF_EVENT(6, "TAPE:mtio\n");
1258 DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op);
1259 DBF_EVENT(6, "TAPE:arg: %x\n", mt_count);
1260
1261 if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS)
1262 return -EINVAL;
1263 fn = device->discipline->mtop_array[mt_op];
1264 if (fn == NULL)
1265 return -EINVAL;
1266
1267
1268 if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF ||
1269 mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) {
1270 rc = 0;
1271 for (; mt_count > 500; mt_count -= 500)
1272 if ((rc = fn(device, 500)) != 0)
1273 break;
1274 if (rc == 0)
1275 rc = fn(device, mt_count);
1276 } else
1277 rc = fn(device, mt_count);
1278 return rc;
1279
1280}
1281
1282
1283
1284
1285static int
1286tape_init (void)
1287{
1288 TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long));
1289 debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1290#ifdef DBF_LIKE_HELL
1291 debug_set_level(TAPE_DBF_AREA, 6);
1292#endif
1293 DBF_EVENT(3, "tape init\n");
1294 tape_proc_init();
1295 tapechar_init ();
1296 tapeblock_init ();
1297 return 0;
1298}
1299
1300
1301
1302
1303static void
1304tape_exit(void)
1305{
1306 DBF_EVENT(6, "tape exit\n");
1307
1308
1309 tapechar_exit();
1310 tapeblock_exit();
1311 tape_proc_cleanup();
1312 debug_unregister (TAPE_DBF_AREA);
1313}
1314
1315MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and "
1316 "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)");
1317MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver");
1318MODULE_LICENSE("GPL");
1319
1320module_init(tape_init);
1321module_exit(tape_exit);
1322
1323EXPORT_SYMBOL(tape_generic_remove);
1324EXPORT_SYMBOL(tape_generic_probe);
1325EXPORT_SYMBOL(tape_generic_online);
1326EXPORT_SYMBOL(tape_generic_offline);
1327EXPORT_SYMBOL(tape_generic_pm_suspend);
1328EXPORT_SYMBOL(tape_put_device);
1329EXPORT_SYMBOL(tape_get_device_reference);
1330EXPORT_SYMBOL(tape_state_verbose);
1331EXPORT_SYMBOL(tape_op_verbose);
1332EXPORT_SYMBOL(tape_state_set);
1333EXPORT_SYMBOL(tape_med_state_set);
1334EXPORT_SYMBOL(tape_alloc_request);
1335EXPORT_SYMBOL(tape_free_request);
1336EXPORT_SYMBOL(tape_dump_sense_dbf);
1337EXPORT_SYMBOL(tape_do_io);
1338EXPORT_SYMBOL(tape_do_io_async);
1339EXPORT_SYMBOL(tape_do_io_interruptible);
1340EXPORT_SYMBOL(tape_cancel_io);
1341EXPORT_SYMBOL(tape_mtop);
1342